AND1U)I'0(U)XE.E. 65 



Vur. incanescens Hack. 1. c. Joints of tlie spikes clotted with 

 white hairs ; sessile spikelets 11 mm. long; first glume longer than 

 the second, ooth sparingly pilose on the keels. 



Colorado, Vascy. 



Var. muticus Hack. D. C. Monog. Phan. 444 (1S80). Like 

 incnnesrens, excepting that the fourth glume is awnless. Leaves 

 and spikelets sparingly pruinose. 



Moiitana. Ward; Colorado, Vuxey. 



'■l-l. A. geminata Hack. ined. A. IlaUu Hack. var. hiqykata 

 Vasey. 



Plant gluiicons, smooth, excepting the margins of the leaf-hlades. 

 Culms simple, rather stout, GO-lOO cm. high, from hard creeping 

 rootstocks. Sheaths terete, the lower as long as the internodes, 

 the upper shorter; ligule ciliate, L5 mm. long; blades setaceo- 

 acuminate, the lower 30 cm. long. 4-0 mm. wide. S})athes 10-12 

 cm. long. Spikes 2, at the apex of the culm and one of the two 

 branches, 3-4 cm. long; i)artially included, racliis and pedicels 

 pubescent on the edges with white or yellowish hairs. Sessile 

 spikelets 8 mm. long, linear-lanceolate, green or tinged with red; 

 first glume firm, minutely 2-toothed, G-nerved, the back with a ver- 

 tical groove; second as lonf; as the first, lanceolate, compressed, 

 1-uerved, the margins hyaline: third G mm. long, linear-lanceolate, 

 3-nerved, the upper third of the margins ciliate; fourth 5 mm. 

 long, 3-toothed. Pedicellate spikelet as long as the sessile, nar- 

 rowly lanceolate; first glume flat below, keeled toward the apex, 

 9-nerved; second mm. long, o-nerved, the margins ciliate along 

 the upper third. Xmlley, for Xat. Mus. 



23. A. provincialis Lam. Encycl. 1:370(1783). A./in-m/i/s 

 Muhl.; Willd. Sp. 4:nin (1800). Blue Stem. BlueJoikt. 

 Tlukky Foot. FiNfJEu Grass. 



Culms 100-150 cm. high, rigid, branching above. Sheaths terete, 

 glabrous, rarely villous: ligule 1-1.5 mm. long; blades of thrifty 

 })lants 00 cm. long, 7 mm. wide, u])per narrow, 1-4 mm. long. 

 Spikes 3-8, digitate, 3-10 em. long. On the sessile spikelet first 

 glume O-nerved, otherwise like the first one on the sterile spikelet; 

 second compressed-keeled, 3-nerved, 5 mm. long; fourth bifid with a 



